Below is an extract
from the EPS Meeting held on 5 April 1865:
Illustration of the application of
Bow then intimated that by way of the practical illustration of the
application of ordinary gas to portrait photography, arrangements had been
made by which they would then proceed to take a negative of one of the
said that experiments showed that with the lenses and chemicals such as
they were about to use, the production of a negative required the proper
burning of about 9 cubic feet of gas, which cost about a halfpenny.
burner might consume this in fifty minutes, and fifty burners would do it
in one minute, so that the time exposure would be altogether regulated by
the number of burners brought into play.
They had arranged to table.
No 2 fish-tail burners, which would consume nine [cubic] feet in from
seven to eight minutes; and if
any of the members could sit for that time, he had no doubt a good
negative could be obtained."
McGlashon and Mr Davies got a plate ready and took an 8 minute
exposure of Mr W Neilson, who had undertaken to sit.
Mr Saddler then sat."